Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/4444#issuecomment-73612005
To help review, this is the schema for saving a tree node:
~~~
id: Int
predict/
|- predict: Double
|- prob: Double
impurity: Double
isLeaf: Boolean
split/
|- feature: Int
|- threshold: Double
|- featureType: Int
|- categories: Array[Double]
leftNodeId: Integer
rightNodeId: Integer
stats/
|- gain: Double
|- impurity: Double
|- leftImpurity: Double
|- rightImpurity: Double
|- leftPredict/
|- predict: Double
|- prob: Double
|- rightPredict/
|- predict: Double
|- prob: Double
~~~
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